Arbitrary self types v2: dev guide updates.

[adetaylor]

No description provided.

[Kobzol]

Sorry, due to me messing up a git operation, we sadly had to force-push the whole commit history of rustc-dev-guide :( If you'd like to update this pull request, you will have to rebase it in a special way onto the new commit history (the new master):

git fetch origin --all
git checkout <pr-branch>
git rebase --onto origin/master origin/master-old
git push --force-with-lease

More context can be found here.

[rustbot]

☔ The latest upstream changes (possibly #2795) made this pull request unmergeable. Please resolve the merge conflicts.

[jyn514]

👋 Hi! I know it's been a very long time. Are you still interested in getting this PR merged? I'm happy to commit to reviewing it (and even rebasing it if you like), I just want to be sure the docs are up to date since they're ~2 years old.

View changes since this review

[jyn514]

Does anyone know who could review this? I see @programmerjake has commented on the tracking issue recently, could you review it for accuracy? Or perhaps write your own docs if this is too outdated?

[programmerjake]

I'm not familiar with the compiler-level implementation of this, my knowledge just comes from iirc the reference's description and the library and from the discussion on how I and some others think we should decouple Deref and Receiver, which lead to rust-lang/rust#146095 by @dingxiangfei2009 which will change how this is done enough that this PR would need to be mostly rewritten.